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3a - 2a = 20 + 30
a = 50°
b) 3a - 30 + 2b = 180° .... (saling berpelurus)
3 .50° - 30° + 2b = 180°
150° - 30° + 2b = 180°
150° + 2b = 180°
2b = 180° - 150°
2b = 30°
b = 30° / 2
b = 15°
c) c = 3a - 30° .... sehadap
c = 3 . 50° - 30°
= 150° - 30°
= 120°
d) 3d = 2b .. dalam berseberangan
3d = 2 .15°
3d = 30°
d = 30 / 3
= 10°
e) 4e = 3d ... bertolak belakang
4.e = 3 . 10°
4 e = 30°
e = 30° / 4
= 7,5°